use warnings;
use strict;

my @retCodes_values;
while (<DATA>) {
    next unless /retCode\=/;
    chomp;
    my ( $string, $exit_code ) = split /retCode\=/, $_, 2;
    push @retCodes_values, [ $string, $exit_code ];
}

for my $aref (@retCodes_values) {
    if ($aref->[1] != 3) {
        print "@{ $aref }\n";
    }
}

__DATA__
15288 :: Mon Mar 2 13:23:32 2015::App.pm:status returned with retCode=1
15288 :: Mon Mar 2 13:24:32 2015::App.pm:status returned with retCode=3
15288 :: Mon Mar 2 13:25:32 2015::App.pm:status returned with retCode=4
15288 :: Mon Mar 2 13:23:32 2015::App.pm:status returned with retCode=5

##</code><code>##

15288 :: Mon Mar 2 13:23:32 2015::App.pm:status returned with  1
15288 :: Mon Mar 2 13:25:32 2015::App.pm:status returned with  4
15288 :: Mon Mar 2 13:23:32 2015::App.pm:status returned with  5